Method and apparatus for the two-step rolling of rings

Abstract

Method and apparatus are provided for the two-step rolling of predominantly profiled rings, for example, anti-friction bearing rings, with diameter enlargement in two rolling steps in one working sequence for the considerable reduction of the stress on the rolling mandrel.

What we claim is: 
     
       1. Apparatus for the two-step rolling of a ring, comprising a bearing housing comprising a first bearing housing arranged coaxially with and on one side of a ring to be rolled and a second bearing housing arranged coaxially with and on another side of said ring opposite said one side, said first and second bearing housings being axially adjustable;   a two-step recessed rolling mandrel supported in said bearing housing, said mandrel having formed thereon a rough-rolling profile having a first smaller diameter and a finished-rolling profile having a second larger diameter;   means in said first bearing housing including a first base bushing axially adjustably and non-rotationally receiving said mandrel;   a sleeve disposed in said second bearing housing having an outer diameter substantially equal to the second larger diameter of said finished-rolling profile;   a second base bushing axially-adjustably and non-rotationally receiving said sleeve;   means defining a borehole in said sleeve, said borehole having a diameter substantially equal to the first diameter of said rough-rolling profile; and   said mandrel including a plug having a diameter substantially equal to the first diameter of said rough-rolling profile, said plug being adapted to be received and suppported in said borehole, whereby two-step rolling of said ring can be performed in one continuous working sequence without changing the position of said ring.   
     
     
       2. Apparatus according to claim 1, further comprising a principal roller located between said first and second bearing housings for contacting an external surface of said ring on one side of said mandrel;   first and second backing-up rollers; and   carrier means for supporting said first and second backing-up rollers between said first and second bearing housings and for removably contacting said backing-up rollers with said external surface of said ring at a side opposite said one side of said mandrel, whereby said ring can be removably held between said principal roller and said backing-up rollers without contacting said mandrel.